JP2014022122A - Battery unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a compact and low cost constitution in a battery unit including a battery and a substrate.SOLUTION: A battery unit (1) includes: a battery (2) including a positive electrode terminal and a negative electrode terminal; a flexible substrate (3) including a positive electrode contact terminal (54) and a negative electrode contact terminal (55) which are brought into contact with the positive electrode terminal and the negative electrode terminal, respectively; and a tube (5) fixing the flexible substrate (3) on the battery (2). The flexible substrate (3) is disposed so as to cover at least a part of the battery (2), and is fixed by the tube (5) without being joined to the battery (2).

Description

  The present invention relates to a battery unit including a battery and a substrate.

  Conventionally, a battery unit including a battery and a substrate is known. As such a configuration, for example, as disclosed in Patent Document 1, one surface of a coin-type electric element (battery) is connected to a substrate by soldering, while the other surface of the coin-type electric element is connected to the other surface. A configuration is known in which a lead plate to be connected is soldered to a substrate.

JP 2002-298804 A

  By the way, as described above, in the case of a configuration in which the battery is electrically connected to the substrate, a connecting member such as a lead plate is required. Therefore, the size of the entire battery unit is increased by the amount of the lead plate. Become. Specifically, since it is necessary to route the lead plate to the outside of the battery, the size of the battery unit increases accordingly. Further, in order to fix the lead plate on the substrate, it is necessary to secure the connection area of the lead plate on the substrate, and the area of the substrate increases accordingly.

  Further, when the battery is soldered to the substrate as described above, the manufacturing cost increases because the soldering work is required.

  Therefore, an object of the present invention is to obtain a compact and low-cost configuration in a battery unit including a battery and a substrate.

  A battery unit according to an embodiment of the present invention includes a battery having a positive electrode terminal and a negative electrode terminal, a flexible substrate having a plurality of contact terminals that respectively contact the positive electrode terminal and the negative electrode terminal, and the flexible substrate on the battery. The flexible substrate is arranged so as to cover at least a part of the battery, and is fixed by the fixing member without being bonded to the battery (first Constitution).

  A flexible substrate having a plurality of contact terminals that are in electrical contact with the positive electrode terminal and the negative electrode terminal of the battery is fixed to the battery so as to cover at least a part of the battery. Thereby, components, such as a lead wire which connects a battery and a flexible substrate, become unnecessary. Therefore, it can be set as a compact structure as the whole battery unit.

  Moreover, the flexible substrate is fixed by the fixing member without being bonded to the battery. This eliminates the need for adhesion or soldering for joining the battery and the substrate. Accordingly, the manufacturing cost of the battery unit can be reduced by the amount of work such as bonding or soldering.

  Here, the bonding means that the flexible substrate and the battery are bonded and integrated, and includes, for example, adhesion, soldering, welding, welding, and the like.

  In the first configuration, the flexible substrate includes a positive terminal contact surface that contacts the positive terminal, a negative terminal contact surface that contacts the negative terminal, and a first terminal contact surface that contacts the first terminal of the device. It is preferable to have a second terminal contact surface that contacts the second terminal of the device and a circuit component mounting surface for mounting circuit components (second configuration).

  As described above, by providing the flexible substrate with a surface in contact with the battery, a surface in contact with the terminal on the device side, and a surface on which the circuit components are mounted, the flexible substrate can be arranged compactly with respect to the battery. Therefore, the battery unit can be made compact.

  In the second configuration, the flexible substrate is provided on the positive electrode terminal contact surface and is in contact with the positive electrode terminal, and the negative electrode contact terminal is provided on the negative electrode terminal contact surface and is in contact with the negative electrode terminal. And a first external terminal provided on the first terminal contact surface and in contact with the first terminal of the device, and a second external terminal provided on the second terminal contact surface and in contact with the second terminal of the device. The first external terminal is in a thickness direction of the flexible substrate with respect to one of the positive contact terminal and the negative contact terminal in a state where the flexible substrate is fixed to the battery. The second external terminal is connected to the other contact terminal of the positive contact terminal and the negative contact terminal in a state where the flexible substrate is fixed to the battery. The preferably provided in a position overlapping in the thickness direction of the flexible substrate (third configuration).

  Accordingly, by pressing the first terminal of the device in the thickness direction of the flexible substrate against the first external terminal of the flexible substrate, one of the positive electrode connection terminal and the negative electrode contact terminal is reliably brought into contact with the battery. Is possible. Similarly, by pressing the second terminal of the device against the second external terminal of the flexible substrate in the thickness direction of the flexible substrate, the other of the positive electrode connection terminal and the negative electrode contact terminal is reliably brought into contact with the battery. Is possible.

  Therefore, by making the first external terminal and the second external terminal contact each terminal of the device with the above-described configuration, the first contact terminal, the second contact terminal, and the battery can be contacted more reliably. Therefore, the electrical connection between the flexible substrate and the battery can be ensured without bonding the flexible substrate and the battery.

  In the third configuration, the battery is formed in a columnar shape, and one end surface functions as one of the positive electrode terminal and the negative electrode terminal, and the other end surface functions as the positive electrode terminal and the negative electrode. The flexible substrate functions as the other terminal of the terminal, and the flexible substrate has a first body portion that contacts one end surface of the battery, a second body portion that contacts the other end surface of the battery, the first body portion, A tongue protruding from at least one of the second body portions, and the first external terminal is preferably provided on a surface of the tongue opposite to the battery (fourth configuration). ).

  Corresponding to the position of the 1st terminal of an apparatus, a 1st external terminal can be more reliably made to contact with the 1st terminal of an apparatus by providing a tongue part and a 1st external terminal in a battery unit.

  In the fourth configuration, the fixing member is disposed so as to cover an outer peripheral side of the battery and the flexible substrate, and the tongue portion is disposed between the base end side of the tongue portion and the flexible substrate. A slit is preferably provided so as to be positioned on the fixing member (fifth configuration). Thereby, it can prevent that a tongue part and a fixing member produce interference.

  In the fourth or fifth configuration, the side surface of the battery functions as the one terminal, the flexible substrate protrudes from at least one of the first main body portion and the second main body portion, and the side surface of the battery. A protrusion that contacts the battery, and the protrusion is provided with the one contact terminal that contacts the one of the positive electrode contact terminal and the negative electrode contact terminal on a surface that contacts the battery. It is preferable (sixth configuration).

  Thereby, a flexible substrate can be more reliably electrically contacted with respect to one terminal of a battery. That is, even when the contact between one surface of the battery and the flexible substrate is unstable, the one terminal of the battery and the flexible substrate can be electrically connected by the above-described configuration.

  In the sixth configuration, the protruding portion is provided at a position overlapping the tongue portion in a state where the flexible substrate is fixed to the battery, and the one contact terminal provided on the protruding portion is It is preferable that the first terminal of the device that contacts the first external terminal of the tongue is pressed to the battery side (seventh configuration).

  Thereby, the contact terminal provided in the protrusion part can be reliably brought into contact with the battery by bringing the first terminal of the device into contact with the first external terminal of the flexible substrate. Therefore, the contact terminal and the battery can be electrically connected without bonding or soldering the protruding portion provided with the contact terminal of the flexible substrate to the battery.

  In the third configuration, it is preferable that the other contact terminal is pressed to the battery side by the second terminal of the device that contacts the second external terminal (eighth configuration). Accordingly, by bringing the second terminal of the device into contact with the second external terminal of the flexible substrate, the other contact terminal can be reliably brought into contact with the battery. Therefore, the other contact terminal and the battery can be electrically connected without bonding or soldering the portion where the other contact terminal of the flexible substrate is provided to the battery. .

  In any one of the second to eighth configurations, the circuit component mounting surface further includes a contactless charging coil electrically connected to the circuit component mounting surface, and the battery is charged by contactless charging. Preferably, the contactless charging coil is disposed on the circuit component mounting surface, and the fixing member is fixed in a state where the battery, the flexible substrate, and the coil are stacked ( Ninth configuration).

  Thereby, the coil for non-contact charge can be arrange | positioned compactly with respect to a battery and a flexible substrate.

  In any one of the first to ninth configurations, the flexible substrate is preferably arranged so as to sandwich the battery (tenth configuration). Thereby, while being able to contact a flexible substrate more reliably with respect to a battery, a flexible substrate can be arrange | positioned more compactly with respect to a battery.

  In any one of the first to tenth configurations, the battery includes a bottomed cylindrical outer can and a bottomed cylindrical sealing can that covers the opening side of the outer can. The outer can is fitted with the opening side of the side wall on the outer peripheral surface of the side wall of the sealing can, the outer can functions as one of the positive terminal and the negative terminal, and the sealing can is It preferably functions as the other terminal of the positive electrode terminal and the negative electrode terminal (eleventh configuration).

  According to the battery unit of one embodiment of the present invention, the flexible substrate is fixed to the battery by the fixing member without joining. This eliminates the need for operations such as bonding or soldering when connecting the battery and the substrate, thereby reducing the manufacturing cost of the battery unit.

1 is a perspective view illustrating a schematic configuration of a battery unit according to Embodiment 1. FIG. FIG. 2 is a cross-sectional view of the section taken along the line II-II in FIG. 1 except for the battery. FIG. 3 is a cross-sectional view showing a schematic configuration of the battery. FIG. 4 is a diagram showing a schematic configuration of the surface of the flexible substrate on the battery side. FIG. 5 is a diagram showing a schematic configuration of the outer surface of the flexible substrate. FIG. 6 is a perspective view showing a state in which the battery is sandwiched between flexible substrates. FIG. 7 is a perspective view of the battery unit as seen from the side opposite to that in FIG. FIG. 8 is a cross-sectional view showing a state in which the battery unit is arranged in the device.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are denoted by the same reference numerals and description thereof will not be repeated.

(overall structure)
FIG. 1 is a perspective view showing a schematic configuration of a battery unit 1 according to Embodiment 1 of the present invention. 2 is a cross-sectional view taken along line II-II in FIG. As shown in FIG. 2, the battery unit 1 includes a battery 2 configured to be chargeable / dischargeable, a flexible substrate 3 disposed so as to sandwich the battery 2, and a coil 4 for non-contact charging. Specifically, in the battery unit 1, the flexible substrate 3 is disposed so as to sandwich the battery 2 in the thickness direction with respect to the flat coin-type battery 2, and the coil 4 is laminated.

  As will be described later, a circuit component 57 for configuring a circuit for controlling the charging of the battery 2 is mounted on the flexible substrate 3 (see FIG. 2). Moreover, as shown in FIG. 2, in the battery unit 1, in the state which laminated | stacked the coil 4 and the battery 2 pinched | interposed by the flexible substrate 3 in those thickness directions, those outer peripheral sides are the tube 5 (fixing member). Covered.

  As shown in FIG. 3, the battery 2 includes a positive electrode can 10 as a bottomed cylindrical outer can, a negative electrode can 20 as a sealing can that covers the opening of the positive electrode can 10, a positive electrode can 10, and a negative electrode can 20. And an electrode body 40 accommodated in a space formed between the negative electrode can 10 and the positive electrode can 20. Therefore, by combining the positive electrode can 10 and the negative electrode can 20, the battery 2 becomes a substantially cylindrical shape having a plurality of surfaces, more precisely, a flat coin shape. In the space formed between the positive electrode can 10 and the negative electrode can 20 of the battery 2, in addition to the electrode body 40, a nonaqueous electrolytic solution (not shown) is also enclosed.

  The positive electrode can 10 is made of a metal material such as stainless steel, and is formed into a bottomed cylindrical shape by press molding. The positive electrode can 10 includes a substantially circular bottom portion 11 (end surface) and a cylindrical peripheral wall portion 12 (side surface) formed continuously with the bottom portion 11 on the outer periphery thereof. The peripheral wall portion 12 is provided so as to extend substantially vertically from the outer peripheral end of the bottom portion 11 in a longitudinal sectional view (the state illustrated in FIG. 3). In the state where the gasket 30 is sandwiched between the positive electrode can 10 and the negative electrode can 20, the opening end side of the peripheral wall portion 12 is bent inward to be caulked against the negative electrode can 20.

  Similarly to the positive electrode can 10, the negative electrode can 20 is made of a metal material such as stainless steel and is formed in a bottomed cylindrical shape by press molding. The negative electrode can 20 has a cylindrical peripheral wall portion 22 whose outer shape is smaller than that of the peripheral wall portion 12 of the positive electrode can 10 and a substantially circular flat surface portion 21 (end surface) that closes one of the openings. Similar to the positive electrode can 10, the peripheral wall portion 22 is also provided so as to extend substantially perpendicular to the flat portion 21 in a longitudinal sectional view. Note that the peripheral wall portion 22 is formed so that the diameter on the opening end portion side becomes larger in a step shape than the base end portion on the flat portion 21 side. The open end side of the peripheral wall portion 12 of the positive electrode can 10 is bent and crimped to the step portion of the peripheral wall portion 22.

  The gasket 30 is made of polypropylene (PP). For example, the gasket 30 is molded on the peripheral wall portion 22 of the negative electrode can 20 so as to be sandwiched between the peripheral wall portion 12 of the positive electrode can 10 and the peripheral wall portion 22 of the negative electrode can 20. The material of the gasket 30 is not limited to PP, and a resin composition containing an olefin elastomer in polyphenylene sulfide (PPS), polytetrafluoroethylene (PFA), a polyamide resin, or the like may be used.

  As shown in FIG. 3, the electrode body 40 is formed by laminating a plurality of substantially disc-shaped positive electrodes 41 and substantially disc-shaped negative electrodes 42 accommodated in a bag-shaped separator 46 in the thickness direction. It becomes. Thereby, the electrode body 40 has a substantially columnar shape as a whole. In addition, the electrode body 40 has a plurality of positive electrodes 41 and negative electrodes 42 laminated so that both end faces are negative electrodes.

  In the positive electrode 41, positive electrode active material layers containing a positive electrode active material such as lithium cobalt oxide are respectively disposed on both surfaces of a positive electrode current collector made of a metal foil such as aluminum.

  In the negative electrode 42, negative electrode active material layers containing a negative electrode active material such as graphite are arranged on both surfaces of a negative electrode current collector made of a metal foil such as copper. The negative electrodes positioned at both ends in the axial direction of the substantially cylindrical electrode body 40 are negative electrode active materials only on one surface side of the negative electrode current collector so that the negative electrode current collector is positioned at the end in the axial direction of the electrode body 40. Has a layer. That is, the substantially cylindrical electrode body 40 has negative electrode current collectors exposed at both ends thereof. One negative electrode current collector of the electrode body 40 abuts on the flat portion 21 of the negative electrode can 20 in a state where the electrode body 40 is disposed between the positive electrode can 10 and the negative electrode can 20. The other negative electrode current collector of the electrode body 40 is positioned on the bottom 11 of the positive electrode can 10 via the insulating sheet 43.

  The separator 46 is a bag-like member formed in a substantially circular shape in plan view, and is formed in a size that can accommodate the substantially disk-shaped positive electrode 41. The separator 46 is constituted by a microporous thin film made of polyethylene having excellent insulating properties. In this way, by forming the separator 46 with a microporous thin film, lithium ions can pass through the separator 46. The separator 46 is formed by wrapping the positive electrode 41 with a single sheet material of a microporous thin film and bonding the overlapping portions of the sheet material by heat welding or the like.

  As shown in FIG. 3, the positive electrode current collector of the positive electrode 41 is integrally formed with a conductive positive electrode lead 44 extending outward from the positive electrode current collector in a plan view. The positive electrode current collector side of the positive electrode lead 44 is also covered with a separator 46.

  The negative electrode current collector of the negative electrode 42 is integrally formed with a conductive negative electrode lead 45 extending outward from the negative electrode current collector in a plan view.

  As shown in FIG. 3, the positive electrode 41 and the negative electrode 42 are such that the positive electrode lead 44 of each positive electrode 41 is positioned on one side and the negative electrode lead 45 of each negative electrode 42 is positioned on the opposite side of the positive electrode lead 44. Is laminated.

  In the state where the plurality of positive electrodes 41 and the negative electrodes 42 are laminated in the thickness direction as described above, the plurality of positive electrode leads 44 are overlapped at the tip side in the thickness direction and connected to the bottom 11 of the positive electrode can 10 by ultrasonic welding or the like. Is done. Thereby, the plurality of positive electrodes 41 and the bottom 11 of the positive electrode can 10 are electrically connected via the plurality of positive electrode leads 44. On the other hand, the plurality of negative electrode leads 45 are also connected to each other by ultrasonic welding or the like with the leading end side overlapped in the thickness direction. Thereby, the plurality of negative electrodes 42 are electrically connected to each other via the plurality of negative electrode leads 45.

  With the above configuration, in the battery 2, the positive electrode can 10 functions as a positive electrode terminal, while the negative electrode can 20 functions as a negative electrode terminal. In the battery unit 1 of this embodiment, the bottom portion 11 and the peripheral wall portion 12 of the positive electrode can 10 function as the positive electrode terminal of the battery 2, and the flat portion 21 of the negative electrode can 20 functions as the negative electrode terminal of the battery 2.

(Flexible substrate)
The flexible substrate 3 is a thin film member made of a resin material. As shown in FIG. 2, the flexible substrate 3 is electrically connected to the bottom portion 11 of the positive electrode can 10, the peripheral wall portion 12, and the flat surface portion 21 of the negative electrode can 20 with respect to the battery 2 having the above-described configuration. Placed in. Specifically, as shown in FIG. 4, the flexible substrate 3 includes a positive electrode side main body portion 51 (first main body portion) and a negative electrode side main body portion 52 (second main body portion) formed in a substantially circular shape, and a positive electrode side. And a connecting portion 53 for connecting the main body 51 and the negative electrode main body 52.

  The positive electrode side main body portion 51 and the negative electrode side main body portion 52 are formed in a substantially circular shape having the same size as the bottom portion 11 of the positive electrode can 10 of the battery 2. As shown in FIG. 2, the positive electrode main body 51 is arranged so as to contact the bottom 11 with respect to the positive electrode can 10. The negative electrode side main body portion 52 is disposed so as to contact the flat surface portion 21 with respect to the negative electrode can 20. That is, the flexible substrate 3 is arranged with respect to the battery 2 so as to sandwich the battery 2 in the thickness direction.

  As shown in FIG. 4, the positive electrode side main body 51 and the negative electrode side main body 52 have a positive electrode contact terminal 54 (contact terminal, first contact terminal) and a negative electrode contact terminal 55 (contact terminal, second contact terminal), respectively. Is formed. The positive electrode contact terminal 54 and the negative electrode contact terminal 55 are formed in a substantially circular shape with a copper foil on one surface of the flexible substrate 3. The positive electrode contact terminal 54 formed on the positive electrode body 51 contacts the bottom 11 of the positive electrode can 10. The negative electrode contact terminal 55 formed on the negative electrode main body 52 contacts the flat surface portion 21 of the negative electrode can 20. That is, FIG. 4 shows the surface of the flexible substrate 3 on the battery 2 side. The surface where the positive electrode contact terminal 54 is provided in the positive electrode body 51 is the positive electrode contact surface 61 of the flexible substrate 3, and the surface where the negative electrode contact terminal 55 is provided in the negative electrode body 52 is the surface of the flexible substrate 3. This is the negative electrode terminal contact surface 62.

  A negative electrode lead 55 a extending into a through hole 52 c formed in the flexible substrate 3 is integrally formed with the negative electrode contact terminal 55. The negative electrode lead 55a extends to the opposite surface of the flexible substrate 3 shown in FIG. 5 through the through hole 52c. The negative electrode lead 55a is electrically connected to a circuit component 57 (described later) provided in the positive electrode main body 51 on the opposite surface (see the broken line arrow in FIG. 5).

  The positive electrode contact terminal 54 is electrically connected to the surface on the opposite side of the positive electrode body 51 through a through hole (not shown). That is, the positive electrode contact terminal 54 is electrically connected to a circuit component 57 described later formed in the positive electrode main body 51.

  FIG. 5 shows a surface of the flexible substrate 3 opposite to the positive electrode connection terminal 54 and the negative electrode connection terminal 55. That is, FIG. 5 shows a surface of the flexible substrate 3 that is located outward with the battery 2 interposed therebetween.

  In the positive electrode main body 51, a plurality of circuit components 57 are mounted on the surface opposite to the surface on which the positive electrode contact terminal 54 is provided (the surface shown in FIG. 5). That is, the surface on which the circuit component 57 is mounted in the positive electrode body 51 is the circuit component mounting surface 65. The circuit component 57 is, for example, a charging IC that controls charging when the battery 2 is charged.

  As shown in FIG. 2, in a state where the flexible substrate 3 is arranged so as to sandwich the battery 2, the circuit component 57 is mounted on the surface of the flexible substrate 3 on the side opposite to the battery 2 in the positive electrode body 51. Yes. Further, on the surface of the positive electrode main body 51 on which the circuit component 57 is mounted, a pattern for connecting the plurality of circuit components 57 is formed, although not particularly illustrated.

  Furthermore, as shown in FIG. 5, the coil 4 is connected to the surface on which the circuit component 57 is mounted in the positive electrode body 51. The coil 4 is electrically connected to a circuit component 57 mounted on the positive electrode main body 51. The coil 4 is connected to the flexible substrate 3 by a copper wire drawn out from the coil 4, and is positioned on the flexible substrate 3 as shown in FIG. 2 by bending the copper wire. That is, the coil 4 is disposed on the surface on which the circuit component 57 is mounted in the positive electrode main body 51 of the flexible substrate 3.

  The negative electrode side main body 52 is provided with a negative electrode external terminal 58 (second external terminal) on the surface opposite to the surface where the negative electrode contact terminal 55 is provided (the surface shown in FIG. 5). Similar to the positive electrode contact terminal 54 and the negative electrode contact terminal 55, the negative electrode external terminal 58 is formed in a substantially circular shape with a copper foil or the like. The negative electrode external terminal 58 is electrically connected to a circuit component 57 mounted on the positive electrode main body 51 through a pattern (not shown) formed in the connection portion 53 (see the broken line arrow in FIG. 5). As shown in FIG. 2, the negative external terminal 58 is exposed to the outside of the battery unit 1 in a state where the flexible substrate 3 is disposed so as to sandwich the battery 2. Thereby, the negative electrode external terminal 58 can contact the negative electrode terminal 104 (refer FIG. 8) of the apparatus 100. FIG. The surface on which the negative electrode external terminal 58 is provided in the negative electrode body 52 is the second terminal contact surface 64 of the flexible substrate 3.

  The negative external terminal 58 is provided on the surface opposite to the negative electrode contact terminal 55 with the negative electrode main body 52 of the flexible substrate 3 interposed therebetween. The negative external terminal 58 is formed at a position overlapping the negative contact terminal 55 in the thickness direction of the flexible substrate 3. Thus, as will be described later, when the negative electrode terminal 104 of the device 100 comes into contact with the negative electrode external terminal 58, the negative electrode contact terminal 55 is pressed toward the negative electrode can 20 side of the battery 2 by the pressing force. The negative electrode can 20 of the battery 2 can surely make contact. Accordingly, the negative electrode contact terminal 55 can be electrically connected to the negative electrode can 20 of the battery 2 without bonding the negative electrode main body 52 to the battery 2 by bonding or soldering.

  As shown in FIG. 4, the positive electrode main body 51 has a protruding portion 51 a on the side opposite to the connection portion 53. The protrusion 51a is formed in a rectangular shape. As shown in FIG. 2, the protruding portion 51 a is positioned on the peripheral wall portion 12 of the positive electrode can 10 with the battery 2 sandwiched between the flexible substrates 3. A peripheral wall portion contact terminal 56 (contact terminal, first contact terminal) is formed on the surface of the protruding portion 51a on the same side as the surface on which the positive electrode contact terminal 54 of the positive electrode side main body portion 51 is provided. The peripheral wall portion contact terminal 56 contacts the peripheral wall portion 12 of the positive electrode can 10. The surface on which the peripheral wall portion contact terminal 56 is provided in the protruding portion 51 a is the positive electrode terminal contact surface of the flexible substrate 3.

  The peripheral wall portion contact terminal 56 is electrically connected to the positive electrode contact terminal 54 provided on the positive electrode side main body portion 51. That is, the peripheral wall contact terminal 56 and the positive electrode contact terminal 54 are at the same potential. Therefore, the positive electrode can 10 and the flexible substrate 3 can be more reliably electrically connected by bringing the positive electrode connection terminal 54 and the peripheral wall portion contact terminal 56 of the flexible substrate 3 into contact with the positive electrode can 10. In the present embodiment, both the positive electrode contact terminal 54 and the peripheral wall portion contact terminal 56 are provided on the flexible substrate 3. However, the present invention is not limited to this, and at least one of the positive electrode contact terminal 54 and the peripheral wall portion contact terminal 56 is provided. Also good.

  As shown in FIG. 4, the negative electrode side main body portion 52 has a tongue portion 52 a on the side opposite to the connection portion 53. The tongue 52 a is formed in a rectangular shape that is longer than the protrusion 51 a of the positive electrode body 51. The tongue portion 52 a is formed by a slit 52 b provided in the negative electrode side main body portion 52 on the base end side located on the negative electrode side main body portion 52 side. That is, a slit 52 b is formed between the base end side of the tongue 52 a and the negative electrode main body 52. Thereby, the tongue part 52a has a length obtained by adding the length of the slit 52b to the protruding length from the negative electrode side main body part 52.

  As shown in FIG. 2, the tongue 52 a is located on the side of the battery 2 in a state where the battery 2 is sandwiched between the flexible substrates 3. That is, in the battery unit 1, the tongue portion 52 a is positioned on the side of the battery unit 1 with its tip portion bent. Further, as described above, when the base end side of the tongue portion 52a is formed by the slit 52b, the outer periphery side of the battery 2, the flexible substrate 3 and the coil 4 is covered with the tube 5 as will be described later. It is possible to prevent the portion 52a from interfering with the tube 5.

  As shown in FIGS. 1, 2, and 5 to 7, the tongue 52 a has a positive external terminal 59 (on the same side as the negative external terminal 58 of the negative main body 52. 1st external terminal) is formed. The positive external terminal 59 is positioned on the side of the battery unit 1 in a state where the battery 2 is sandwiched between the flexible substrates 3 as shown in FIGS. Thereby, the positive external terminal 59 is exposed to the outside and contacts the positive terminal 103 of the device 100. The positive electrode external terminal 59 is also electrically connected to the circuit component 57 mounted on the positive electrode main body 51 through a pattern (not shown) formed in the negative electrode main body 52 and the connection portion 53 (see FIG. (See 5 dashed arrows). The surface on which the positive electrode external terminal 59 is provided in the tongue portion 52 a is the first terminal contact surface 63 of the flexible substrate 3.

  As shown in FIG. 6, the protruding portion 51 a of the positive electrode body 51 is positioned on the side surface of the battery 2 with the battery 2 sandwiched between the flexible substrates 3. And the tongue part 52 of the negative electrode side main-body part 52 is positioned on the protrusion part 51a. In this manner, the protrusion 51 a that contacts the positive electrode can 10 of the battery 2 and the tongue 52 that contacts the positive electrode terminal 103 of the device 100 are arranged in the thickness direction of the flexible substrate 3 so as to be described later. The protrusion 51a and the tongue 52 are pressed by the positive terminal 103 (see FIG. 8) of the device 100. Thereby, while being able to contact the positive electrode terminal 103 of the apparatus 100 and the positive electrode external terminal 59 of the tongue part 52, the battery 2 and the surrounding wall part contact terminal 56 of the protrusion part 51 can be contacted more reliably. Therefore, the positive electrode main body 51 can be electrically connected to the positive electrode can 10 of the battery 2 without bonding the positive electrode main body 51 to the battery 2 with an adhesive or solder.

  Connection portion 53 has a length equivalent to the thickness of battery 2. That is, the connecting portion 53 is the flat portion 21 of the negative electrode can 20 of the battery 2 in the state where the positive electrode main body 51 of the flexible substrate 3 is disposed on the bottom 11 of the positive electrode can 10 of the battery 2. It has such a length as to be located above. Thereby, the flexible substrate 3 can be arranged more compactly with respect to the battery 2.

  The tube 5 (fixing member) is made of a resin material that shrinks by heat, such as PET (polyethylene terephthalate). As shown in FIGS. 1, 2, and 7, the tube 5 is attached so as to cover the outer peripheral side of the battery 2 sandwiched between the flexible substrates 3 and the coil 4. Thereby, the battery 2, the flexible substrate 3, and the coil 4 can be fixed to each other by the tube 5.

  As described above, the slit 52 b is formed between the base end side of the tongue portion 52 a of the negative electrode side main body portion 52 of the flexible substrate 3 and the negative electrode side main body portion 52. Therefore, as shown in FIGS. 1, 2, and 7, when the tube 5 is disposed on the outer peripheral side of the battery 2 and the coil 4 sandwiched between the flexible substrates 3, the tongue portion 52 a is positioned on the tube 5. Thereby, it can prevent that the tongue part 52a and the tube 5 interfere.

(Connection structure with equipment)
FIG. 8 shows a state in which the battery unit 1 having the above-described configuration is housed in the device 100. The device 100 includes a storage recess 101 that can store the battery unit 1 and a battery cover 102 that covers the storage recess 101. Note that the device 100 is a small device using a coin-type battery, such as a pedometer, a hearing aid, an automobile electronic key, an IC tag, and a sensor unit.

  The storage recess 101 is a substantially columnar space formed in the device 100, and is formed by a substantially cylindrical side surface 101a and a substantially circular bottom surface 101b. The battery cover 102 is fixed to the device 100 in a state where the storage recess 101 is covered. The storage recess 101 and the battery cover 102 form a storage space for storing the battery unit 1.

  As shown in FIG. 8, a positive electrode terminal 103 (first terminal) and a negative electrode terminal 104 (second terminal) are provided on the surface constituting the housing recess 101 of the device 100. In the example shown in FIG. 8, the positive electrode terminal 103 is disposed on the side surface 101 a constituting the housing recess 101. The negative terminal 104 is disposed on the bottom surface 101 b that constitutes the housing recess 101. The positive terminal 103 and the negative terminal 104 are each electrically connected to a circuit (not shown) in the device 100.

  Each of the positive electrode terminal 103 and the negative electrode terminal 104 is configured by an elastically deformable leaf spring. In other words, in the example shown in FIG. 8, the positive terminal 103 and the negative terminal 104 are formed as flat members extending in one direction, and one end is fixed to the inner surface of the housing recess 101.

  The positive electrode terminal 103 applies a biasing force to the side surface of the battery unit 1 so as to press the battery unit 1 against the side surface 101 a facing the housing recess 101. The battery unit 1 is disposed in the housing recess 101 so that the positive electrode external terminal 59 of the tongue 52a contacts the positive electrode terminal 103. Thereby, the positive electrode terminal 103 of the device 100 can be reliably brought into contact with the positive electrode external terminal 59 of the battery unit 1. In addition, since the tongue portion 52 a is pressed by the positive electrode terminal 103, the protruding portion 51 a disposed so as to overlap the tongue portion 52 a and the thickness direction of the flexible substrate 3 is also pressed against the side surface of the battery 2. Therefore, the positive electrode contact terminal 54 of the protruding portion 51 a can be more reliably brought into contact with the battery 2.

  The negative electrode terminal 104 applies a biasing force to the bottom surface of the battery unit 1 so as to press the battery unit 1 against the battery cover 102 covering the housing recess 101. The battery unit 1 is disposed in the housing recess 101 so that the negative electrode external terminal 58 of the flexible substrate 3 is in contact with the negative electrode terminal 104. Thereby, the negative electrode terminal 104 of the apparatus 100 can be reliably brought into contact with the negative electrode external terminal 58 of the battery unit 1. Moreover, by applying a biasing force to the bottom surface of the battery unit 1 by the negative electrode terminal 104, the negative electrode contact terminal 55 provided on the negative electrode side main body portion 52 of the flexible substrate 3 is replaced with the flat portion 21 of the negative electrode can 20 of the battery 2. Can be pressed against. Therefore, the negative electrode contact terminal 55 of the flexible substrate 3 can be more reliably brought into contact with the battery 2. In the case of this embodiment, the positive electrode contact terminal 54 provided on the positive electrode body 51 of the flexible substrate 3 is also pressed against the bottom 11 of the positive electrode can 10 of the battery 2 by the urging force of the negative electrode terminal 104. Thereby, the positive electrode contact terminal 54 of the flexible substrate 3 can be more reliably brought into contact with the battery 2.

  With the above configuration, the positive electrode terminal 103 and the negative electrode terminal 104 can be more reliably electrically connected to the battery 2, and the positive electrode contact terminal 54 and the negative electrode contact terminal 55 of the flexible substrate 3 can be connected to the battery 2. In addition, the peripheral wall contact terminal 56 can be more reliably electrically connected.

(Effect of embodiment)
In this embodiment, the flexible substrate 3 is disposed so as to sandwich the battery 2. The flexible substrate 3 is stacked on the battery 2 without being bonded by bonding or soldering. This eliminates the need for operations such as bonding or soldering, so that the manufacturing cost of the battery unit 1 can be reduced accordingly.

  The flexible substrate 3 is disposed so as to sandwich the battery 2. In addition, the flexible substrate 3 includes a positive electrode contact terminal 54 and a negative electrode contact terminal 55 that contact the positive electrode can 10 and the negative electrode can 20 of the battery 2, respectively, and a positive electrode external terminal 59 that contacts the positive electrode terminal 103 and the negative electrode terminal 104 of the device 100. And a negative external terminal 58. As a result, the flexible substrate 3 can be compactly arranged with respect to the battery 2 and lead wires and the like are not required, so that the battery unit 1 as a whole can be made compact.

  Further, the positive external terminal 59 and the positive contact terminal 54 are provided on the flexible substrate 3 at a position overlapping with the thickness direction of the flexible substrate 3. Further, the negative electrode external terminal 58 and the negative electrode contact terminal 55 are provided on the flexible substrate 3 at a position overlapping the thickness direction of the flexible substrate 3. Thereby, the positive electrode contact terminal 54 can be pressed against the positive electrode can 10 of the battery 2 by bringing the positive electrode terminal 103 of the device 100 into contact with the positive electrode external terminal 59. Further, the negative electrode contact terminal 55 can be pressed against the negative electrode can 20 of the battery 2 by bringing the negative electrode terminal 104 of the device 100 into contact with the negative electrode external terminal 58. Therefore, by disposing the battery unit 1 in the device 100, the positive electrode contact terminal 54 and the negative electrode contact terminal 55 of the flexible substrate 3 and the battery 2 can be more reliably brought into contact with each other. Therefore, the battery 2 and the flexible substrate 3 can be electrically connected without bonding the flexible substrate 3 to the battery 2 by bonding or soldering.

  Furthermore, by providing a slit 52b between the base end side of the tongue portion 52a provided with the positive electrode external terminal 59 and the negative electrode side main body portion 52, the tongue portion 52a can be disposed on the upper side of the tube 5. Therefore, interference between the tongue 52a and the tube 5 can be prevented.

(Other embodiments)
While the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiment, and the above-described embodiment can be appropriately modified and implemented without departing from the spirit of the invention.

  In the above embodiment, a coin-shaped flat battery is used as the battery 2, but this is not restrictive, and any shape of secondary battery may be used. The battery may be a primary battery. When the battery is a primary battery, the wireless power feeding coil 4 is not necessary, and a capacitor or the like is mounted on the substrate 3.

  In the embodiment, the flexible substrate 3 has a shape in which the substantially circular positive electrode body 51 and the negative electrode body 52 are connected by the connecting portion 53. However, the positive electrode terminal contact surface and the negative electrode terminal contact surface that contact the positive electrode terminal and the negative electrode terminal of the battery 2, respectively, the first terminal contact surface and the second terminal contact surface that contact the positive electrode terminal 103 and the negative electrode terminal 104 of the device 100, respectively. The flexible substrate 3 may have any shape as long as the shape has a circuit component mounting surface for mounting the circuit component 57.

  In the embodiment, the protruding portion 51 a is provided on the positive electrode body 51 of the flexible substrate 3, and the tongue 52 a is provided on the negative electrode body 52. However, the protruding portion 51 a may be provided on the negative electrode body 52 and the tongue 52 a may be provided on the positive electrode body 51. Further, the protruding portion 51 a and the tongue portion 52 a may be provided together on either the positive electrode side main body portion 51 or the negative electrode side main body portion 52. Further, the protruding portion 51 a and the tongue portion 52 a may be provided at a position other than the position overlapping the thickness direction of the flexible substrate 3.

  In the above embodiment, the positive electrode contact terminal 54, the negative electrode contact terminal 55, and the negative electrode external terminal 58 are substantially circular. However, the positive electrode contact terminal 54, the negative electrode contact terminal 55, and the negative electrode external terminal 58 may have a shape other than a circle such as a rectangular shape. Moreover, in the said embodiment, although the surrounding wall part contact terminal 56 and the positive electrode external terminal 59 are made into the rectangular shape, shapes other than a rectangle, such as circular shape, may be sufficient, for example.

  In the embodiment, the outer can is the positive electrode can 10 and the sealed can is the negative electrode can 20. However, the present invention is not limited to this, and the outer can may be the negative electrode can and the sealed can may be the positive electrode can. In this case, the peripheral wall portion contact terminal 56 may be set to the same potential as the negative electrode contact terminal 55. In the embodiment, the positive electrode contact terminal 54 and the peripheral wall contact terminal 56 are the first contact terminals, the negative electrode contact terminal 55 is the second contact terminal, the positive electrode terminal 103 of the device 100 is the first terminal, and the negative electrode terminal 104 is. Is the second terminal. However, the negative contact terminal 55 is a first contact terminal, the positive contact terminal 54 and the peripheral wall contact terminal 56 are second contact terminals, the negative terminal 104 of the device 100 is a first terminal, and the positive terminal 103 is a second terminal. Also good.

  The battery unit by this invention can be utilized for the structure provided with the battery and the board | substrate.

1: battery unit, 2: battery, 3: flexible substrate, 4: coil (non-contact charging coil), 5: tube (fixing member), 10: positive electrode can, 11: bottom (end face), 12: peripheral wall ( Side surface), 20: negative electrode can, 21: flat surface portion (end surface), 22: peripheral wall portion, 51: positive electrode side main body portion (first main body portion), 51a: protruding portion, 52: negative electrode side main body portion (second main body portion) ), 52a: tongue, 52b: slit, 53: connection, 54: positive contact terminal (contact terminal, first contact terminal), 55: negative contact terminal (contact terminal, second contact terminal), 56: peripheral wall Contact terminal (contact terminal, first contact terminal), 57: circuit component, 58: negative external terminal (second external terminal), 59: positive external terminal (first external terminal), 61: positive terminal contact surface, 62: Negative terminal contact surface, 63: first terminal contact surface, 64: second terminal contact surface, 65 The circuit component mounting surface, 100: apparatus, 101: housing recess, 101a: side, 101b: bottom, 102: battery cover, 103: positive electrode terminal (first terminal), 104: negative electrode terminal (second terminal)

Claims (11)

A battery having a positive terminal and a negative terminal;
A flexible substrate having a plurality of contact terminals in contact with each of the positive electrode terminal and the negative electrode terminal;
A fixing member for fixing the flexible substrate on the battery,
The flexible substrate is arranged to cover at least a part of the battery, and is fixed by the fixing member without being bonded to the battery. The battery unit according to claim 1,
The flexible substrate is
A positive terminal contact surface in contact with the positive terminal;
A negative terminal contact surface in contact with the negative terminal;
A first terminal contact surface that contacts the first terminal of the device;
A second terminal contact surface that contacts the second terminal of the device;
A battery unit having a circuit component mounting surface for mounting the circuit component. The battery unit according to claim 2,
The flexible substrate is
A positive electrode contact terminal provided on the positive electrode terminal contact surface and in contact with the positive electrode terminal;
A negative electrode contact terminal provided on the negative electrode terminal contact surface and in contact with the negative electrode terminal;
A first external terminal provided on the first terminal contact surface and in contact with the first terminal of the device;
A second external terminal provided on the second terminal contact surface and in contact with the second terminal of the device;
The first external terminal is provided at a position overlapping with one of the positive contact terminal and the negative contact terminal in the thickness direction of the flexible substrate in a state where the flexible substrate is fixed to the battery. ,
The second external terminal is provided at a position overlapping with the other contact terminal of the positive electrode contact terminal and the negative electrode contact terminal in the thickness direction of the flexible substrate in a state where the flexible substrate is fixed to the battery. , Battery unit. The battery unit according to claim 3,
The battery is formed in a columnar shape, and one end surface functions as one of the positive electrode terminal and the negative electrode terminal, and the other end surface functions as the other terminal of the positive electrode terminal and the negative electrode terminal. And
The flexible substrate is
A first main body that contacts one end surface of the battery;
A second main body that contacts the other end surface of the battery;
A tongue projecting from at least one of the first main body and the second main body,
The first external terminal is a battery unit provided on a surface of the tongue portion opposite to the battery. The battery unit according to claim 4,
The fixing member is arranged so as to cover the outer peripheral side of the battery and the flexible substrate,
A battery unit, wherein a slit is provided between the base end side of the tongue and the flexible substrate so that the tongue is positioned on the fixing member. The battery unit according to claim 4 or 5,
The battery also functions as one terminal of the side surface,
The flexible substrate further has a protruding portion that protrudes from at least one of the first main body portion and the second main body portion and contacts a side surface of the battery,
The battery unit, wherein the protruding portion is provided with the one contact terminal that contacts the one of the positive electrode contact terminal and the negative electrode contact terminal on a surface that contacts the battery. The battery unit according to claim 6, wherein
The protrusion is provided at a position overlapping the tongue in a state where the flexible substrate is fixed to the battery.
The battery unit, wherein the one contact terminal provided on the projecting portion is pressed toward the battery by the first terminal of the device that contacts the first external terminal of the tongue. The battery unit according to claim 3,
The other contact terminal is pressed to the battery side by the second terminal of the device that contacts the second external terminal. The battery unit according to any one of claims 2 to 8,
Further comprising a non-contact charging coil electrically connected to the circuit component mounting surface,
The battery is a secondary battery charged by non-contact charging,
The non-contact charging coil is disposed on the circuit component mounting surface,
The fixing member is a battery unit that fixes the battery, the flexible substrate, and the coil in a stacked state. The battery unit according to any one of claims 1 to 9,
The flexible substrate is a battery unit arranged so as to sandwich the battery. The battery unit according to any one of claims 1 to 10,
The battery has a bottomed cylindrical outer can and a bottomed cylindrical sealing can covering the opening side of the outer can,
The exterior can is fitted with the opening side of the side wall on the outer peripheral surface of the side wall of the sealing can,
The outer can functions as one of the positive terminal and the negative terminal,
The said sealing can is a battery unit which functions as the other terminal of the said positive electrode terminal and the said negative electrode terminal.

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